One of the toughest things in my journey of Manga and Anime is simply picking things back up.
Attack on Titan has been great but it's taken years for the anime to catch up to where I left off in the Manga.
I'm glad I did wait for the anime to catch up but this is a problem I've faced across the board where it's simply too much of a task to pick certain titles back up due to losing my place in the abundance of chapters.
Thankfully lists and apps have made life much easier.